where \(z>0\) .
Using a symmetric relation [1]} satisfied by the basic function \({_1}\phi _1(0;\omega ;q,z)\) , Olde Daalhuis [2]} describes briefly how to obtain an asymptotic expansion for the function
\(J_{\nu }\big (z;q^{2}\big )=z^{\nu }\frac{(q^{\nu +1};q)_{\infty }}{(q;q)_{\infty }}{_1}\phi _1\big (0;q^{2(\nu +1)};q,qz^2\big ).\) 
